Pulley.



."'To all :wh-om 'it may concern: i h 'Bte itknown that I, OLIVER Drrswon'rii, a citizen ofthe United States, and a resiwww OFFICE.

OLIVER. nirswoivrn, or Mourir CARROLL, ILLINOIS.

PULLY.

i --dent of Mount Carroll,in the county of Car- "and useful Improvement in Pulleys, of

roll, State of Illinois, have-invented a new which1 the following'is a specification.

.This invention relates to pulleys designed -for/t-he 'transmission of power and especially adapted for` use in connection with high speed motor shafts from which power is to be transmitted to machines through flexible leather or fabric belts. The pulley is welladapted for use upon a thresh- '15 ing 'machine cylinder which is tovbe driven by a belt from a traction engine, upon dy- `narno shafts, and the like. It is to be 'u n- -derstood, however that I am not-"to vbe limited to any specific application of the invention, reserving the right to employ vthe principle of the invention in any capacity in which it may be found applicable.

The object ofthe invention is to construct a pulley "of the character indicated so that the lagging will be securely held in place -without the .use of nails, screws, rivets, or

lso

any other metallic fasteners which prove in' practice vso destructive to the belt, due to 'the fact that the lagging vwill soon wear down, leaving the fasteners exposed and in deteriorating contact with the working surface of the belt.

Another object is to construct a pulley whose rim is covered with a non-metallic material of homogeneous nature, which possesses uniformly good gripping qualities and which may easily be renewed if nec- The foregoing and other objects are attained by the construction hereinafter fully :described and claimed, andl illustrated in the accompanying drawings, 1n which- Figure 1 is a vertical sectional view of :the pulley shown as applied to a conventional form of motorcycle motor; Fig. 2. is-

an elevation of the pulley hub, and Fig. S is a detail lof one of the '-side plates on a "smaller scale than Fig. 2.

Throughout the following description and on the several ligures of the drawings similar parts are referred to by like referenceA- characters.

-As herein illustrated 4the pulley comprises j a hub 10, al pair off side plates l1 and 12, and

a series of washers 13 constituting the lag- `ging, said washers being adapted to be Specification of Letters Patent. i

Patented Apr. 2, 1912.

. Application filed July 29, 1911. Serial No. 641,251.

" gripped by the substantially parallelflanges plates are capable offree rotation with relation to the hub. When the power shaft is rotated in the direction indicated by the arrow the elfect of the right and left threads is to cause the" plates 11 and 12 to approach eachv other simultaneously and thus grip the lagging securely between them. The greater the rotative force applied to the pulley hub, with a corresponding resistance to such rotation, the. tighter will the lagging.

be gripped. Should the shaft shown be one to be driven by lthe pulley the opposite direction, power applied to the pulley will have the same effect on the lagging as that hereinbefore described.

When it becomes necessary to renew or replace any. or all of the layers or laminae of the lagging the outer plate 11 may be' unscrewed from' the hub by application of a spanner to the holes 11', which will free the laminas and leave the pulley in condition for the desired renewal, when the said outer plate may be returned to its normal position. This operation may be effected with or without removing the pulley from the shaft. It is to be noted that the said outer plate 11, but for the spanner holes, is

or guard for the end of the shaftand nut,

an item of vast importance in all classes of high speed machinery.

The several parts of the pulley may be smooth and constitutes an effective closure made of any material suitable for the pury Vpose for which the pulley is intended, and

the relative sizes or proportions of the same may be varied to a great extentvwithout departing from the spirit of the invention claimed. Y

Having thus described Ka preferred embodiment of the invention, what I claim and desireA to protect by Letters Patent of the United States is: y 1. The herein described pulley comprising v a hub provided with right and left threaded portions, a pair of side plates having threaded engagement with the 'aforesaid hub portions and movable toward and from each other, and a non-metallic rim freely rotatable with relation to said hub and adapted to be gripped between said side plates by virtue .of such relative rotation between the hub and the rim, substantially as set forth. 2. The hereindescribed pulley comprising a Cylindrical hub, whose periphery is provided with right and left threaded portions,

a pair of side plates having cylindrical portions with right and left threads coperating with the aforesaid threaded hub portions, respectively, said plates also having outwardly extending flanges, and a series of non-metallic washers constituting the pulley lagging mounted loosely for rotation upon the hub but adapted to be gripped between said outwardly extending ianges when the side plates are caused toapproach eac-h other by virt'ue of such rotation.

3. The combination of a shaft, a pulley comprising a hub centrally bored and fitted to said shaft, non-metallic lagging, and a pair of platesremovably secured to the hub and gripping the lagging therebetween and constituting the sole means for securing the lagging upon the hub, and a fastener securing the hub upon the shaft, one of said plates constituting a guard inclosing said shaft fastener, substantially as set forth. i

In testimony whereof I have hereunto affixed my signature in the presence of two subscribing witnesses.

OLIVER DITSWORTH. Witnesses:

AARON K. SWEITZER,

EDWARD Swnrrznn. 

